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Data Transmission System

Publishing Venue

IBM

Related People

Yonemochi, K: AUTHOR

Abstract

This article describes a system wherein two devices communicate with a host via a common adapter. The first one of the devices is operable to check the status of the adapter prior to data transmission, while the second device is operable to transmit data without doing such a status check. The adapter is able to suspend the data transmission being conducted between the first device and it when the second device begins the transmission of data. Subsequently, the first device continuously checks the status of the adapter until it is permitted to transmit the suspended data again. By these arrangements, data from the devices are prevented from missing and the time loss in the second device is minimized. In Fig. 1, a device I communicates with an adapter via a cable. The adapter is also connected to a host by a cable.

Country

United States

Language

English (United States)

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Data Transmission System

This article describes a system wherein two devices communicate with a host
via a common adapter. The first one of the devices is operable to check the
status of the adapter prior to data transmission, while the second device is
operable to transmit data without doing such a status check. The adapter is able
to suspend the data transmission being conducted between the first device and it
when the second device begins the transmission of data. Subsequently, the first
device continuously checks the status of the adapter until it is permitted to
transmit the suspended data again. By these arrangements, data from the
devices are prevented from missing and the time loss in the second device is
minimized. In Fig. 1, a device I communicates with an adapter via a cable. The
adapter is also connected to a host by a cable. The device I may be a keyboard
which functions to perform a key scan operation and check status of the adapter
for data transmission to it. A device II may be a keypad which transmits data to
the adapter by means of infrared light without doing the status check. The
adapter operates as indicated by the flow chart in Fig. 2. At step 21, the adapter
sets to a receive enable status wherein it can receive data from any other
devices. If data is transmitted from the device II (step 22), the adapter receives it
while it inhibits data transmission from the host and the device I (steps 2526),
and then the data is transferred to the host...